# x402 ForgeMesh Knowledge Lookup

> x402 ForgeMesh Knowledge Lookup is a paid API for AI agents from x402.forgemesh.io, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Returns the lead summary of any English-language encyclopedia article — title, description, extract, thumbnail, and canonical URL — as JSON.

## Facts

- Endpoint: POST https://x402.forgemesh.io/knowledge-lookup
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-forgemesh-knowledge-lookup-eec7eb1c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gcnROKt6hQ9G2WBVuWYXM

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability x402-forgemesh-knowledge-lookup-eec7eb1c -d '<json body>'
```

Example prompt: Can you look up a quick encyclopedia summary for 'Marie Curie' — I need her one-line description, a short extract, and the canonical article URL?

## When to prefer this

Use this endpoint when you need a structured, machine-readable encyclopedia summary for a named entity — person, place, concept, or event — especially for entity enrichment pipelines, knowledge graph population, or fact grounding. Prefer it over raw web search when you want clean JSON with a canonical description, extract, and thumbnail rather than unstructured HTML. The $0.003 per-call pricing makes it cost-effective for moderate-volume enrichment tasks.

## Known failure modes

- Article title not found — returns an error or empty result if the title does not match any encyclopedia article
- Disambiguation required — a vague title (e.g. 'Mercury') may return the wrong article
- Non-English titles — endpoint covers English-language articles only, foreign-language titles may fail
- Payment failure — insufficient USDC balance or x402 payment handshake fails
- Network timeout — upstream Wikimedia API latency causes delayed or failed response

## How this service works

Encyclopedia summary API: the lead summary of any English-language encyclopedia article — title, one-line description, extract paragraph, thumbnail, and canonical URL — as JSON. For entity enrichment, fact grounding, and knowledge agents. CC BY-SA content with attribution included.

## Output

A JSON object containing the article title, a one-line description, an introductory extract paragraph, a thumbnail image URL, and the canonical encyclopedia URL for the queried entity. Content is CC BY-SA licensed with attribution included.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "title": {
   "type": "string",
   "description": "Article title, e.g. Alan Turing"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {
   "title": "Alan Turing",
   "extract": "Alan Mathison Turing was an English mathematician...",
   "description": "English computer scientist (1912–1954)"
  },
  "attribution": "Wikipedia, CC BY-SA 4.0"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-forgemesh-knowledge-lookup-eec7eb1c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.forgemesh.io](https://www.zero.xyz/host/x402.forgemesh.io/llms.txt)